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Linux/sound/pci/cs5535audio/cs5535audio_pcm.c

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  1 /*
  2  * Driver for audio on multifunction CS5535 companion device
  3  * Copyright (C) Jaya Kumar
  4  *
  5  * Based on Jaroslav Kysela and Takashi Iwai's examples.
  6  * This work was sponsored by CIS(M) Sdn Bhd.
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 21  *
 22  * todo: add be fmt support, spdif, pm
 23  */
 24 
 25 #include <linux/init.h>
 26 #include <linux/pci.h>
 27 #include <sound/core.h>
 28 #include <sound/control.h>
 29 #include <sound/initval.h>
 30 #include <sound/asoundef.h>
 31 #include <sound/pcm.h>
 32 #include <sound/pcm_params.h>
 33 #include <sound/ac97_codec.h>
 34 #include "cs5535audio.h"
 35 
 36 static const struct snd_pcm_hardware snd_cs5535audio_playback =
 37 {
 38         .info =                 (
 39                                 SNDRV_PCM_INFO_MMAP |
 40                                 SNDRV_PCM_INFO_INTERLEAVED |
 41                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 42                                 SNDRV_PCM_INFO_MMAP_VALID |
 43                                 SNDRV_PCM_INFO_PAUSE |
 44                                 SNDRV_PCM_INFO_RESUME
 45                                 ),
 46         .formats =              (
 47                                 SNDRV_PCM_FMTBIT_S16_LE
 48                                 ),
 49         .rates =                (
 50                                 SNDRV_PCM_RATE_CONTINUOUS |
 51                                 SNDRV_PCM_RATE_8000_48000
 52                                 ),
 53         .rate_min =             4000,
 54         .rate_max =             48000,
 55         .channels_min =         2,
 56         .channels_max =         2,
 57         .buffer_bytes_max =     (128*1024),
 58         .period_bytes_min =     64,
 59         .period_bytes_max =     (64*1024 - 16),
 60         .periods_min =          1,
 61         .periods_max =          CS5535AUDIO_MAX_DESCRIPTORS,
 62         .fifo_size =            0,
 63 };
 64 
 65 static const struct snd_pcm_hardware snd_cs5535audio_capture =
 66 {
 67         .info =                 (
 68                                 SNDRV_PCM_INFO_MMAP |
 69                                 SNDRV_PCM_INFO_INTERLEAVED |
 70                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 71                                 SNDRV_PCM_INFO_MMAP_VALID
 72                                 ),
 73         .formats =              (
 74                                 SNDRV_PCM_FMTBIT_S16_LE
 75                                 ),
 76         .rates =                (
 77                                 SNDRV_PCM_RATE_CONTINUOUS |
 78                                 SNDRV_PCM_RATE_8000_48000
 79                                 ),
 80         .rate_min =             4000,
 81         .rate_max =             48000,
 82         .channels_min =         2,
 83         .channels_max =         2,
 84         .buffer_bytes_max =     (128*1024),
 85         .period_bytes_min =     64,
 86         .period_bytes_max =     (64*1024 - 16),
 87         .periods_min =          1,
 88         .periods_max =          CS5535AUDIO_MAX_DESCRIPTORS,
 89         .fifo_size =            0,
 90 };
 91 
 92 static int snd_cs5535audio_playback_open(struct snd_pcm_substream *substream)
 93 {
 94         int err;
 95         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
 96         struct snd_pcm_runtime *runtime = substream->runtime;
 97 
 98         runtime->hw = snd_cs5535audio_playback;
 99         runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_FRONT_DAC];
100         snd_pcm_limit_hw_rates(runtime);
101         cs5535au->playback_substream = substream;
102         runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK]);
103         if ((err = snd_pcm_hw_constraint_integer(runtime,
104                                 SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
105                 return err;
106 
107         return 0;
108 }
109 
110 static int snd_cs5535audio_playback_close(struct snd_pcm_substream *substream)
111 {
112         return 0;
113 }
114 
115 #define CS5535AUDIO_DESC_LIST_SIZE \
116         PAGE_ALIGN(CS5535AUDIO_MAX_DESCRIPTORS * sizeof(struct cs5535audio_dma_desc))
117 
118 static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au,
119                                          struct cs5535audio_dma *dma,
120                                          struct snd_pcm_substream *substream,
121                                          unsigned int periods,
122                                          unsigned int period_bytes)
123 {
124         unsigned int i;
125         u32 addr, desc_addr, jmpprd_addr;
126         struct cs5535audio_dma_desc *lastdesc;
127 
128         if (periods > CS5535AUDIO_MAX_DESCRIPTORS)
129                 return -ENOMEM;
130 
131         if (dma->desc_buf.area == NULL) {
132                 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
133                                         snd_dma_pci_data(cs5535au->pci),
134                                         CS5535AUDIO_DESC_LIST_SIZE+1,
135                                         &dma->desc_buf) < 0)
136                         return -ENOMEM;
137                 dma->period_bytes = dma->periods = 0;
138         }
139 
140         if (dma->periods == periods && dma->period_bytes == period_bytes)
141                 return 0;
142 
143         /* the u32 cast is okay because in snd*create we successfully told
144            pci alloc that we're only 32 bit capable so the uppper will be 0 */
145         addr = (u32) substream->runtime->dma_addr;
146         desc_addr = (u32) dma->desc_buf.addr;
147         for (i = 0; i < periods; i++) {
148                 struct cs5535audio_dma_desc *desc =
149                         &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[i];
150                 desc->addr = cpu_to_le32(addr);
151                 desc->size = cpu_to_le16(period_bytes);
152                 desc->ctlreserved = cpu_to_le16(PRD_EOP);
153                 desc_addr += sizeof(struct cs5535audio_dma_desc);
154                 addr += period_bytes;
155         }
156         /* we reserved one dummy descriptor at the end to do the PRD jump */
157         lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods];
158         lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr);
159         lastdesc->size = 0;
160         lastdesc->ctlreserved = cpu_to_le16(PRD_JMP);
161         jmpprd_addr = cpu_to_le32(lastdesc->addr +
162                                   (sizeof(struct cs5535audio_dma_desc)*periods));
163 
164         dma->substream = substream;
165         dma->period_bytes = period_bytes;
166         dma->periods = periods;
167         spin_lock_irq(&cs5535au->reg_lock);
168         dma->ops->disable_dma(cs5535au);
169         dma->ops->setup_prd(cs5535au, jmpprd_addr);
170         spin_unlock_irq(&cs5535au->reg_lock);
171         return 0;
172 }
173 
174 static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au)
175 {
176         cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN);
177 }
178 
179 static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au)
180 {
181         cs_writeb(cs5535au, ACC_BM0_CMD, 0);
182 }
183 
184 static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au)
185 {
186         cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE);
187 }
188 
189 static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au,
190                                            u32 prd_addr)
191 {
192         cs_writel(cs5535au, ACC_BM0_PRD, prd_addr);
193 }
194 
195 static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au)
196 {
197         return cs_readl(cs5535au, ACC_BM0_PRD);
198 }
199 
200 static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au)
201 {
202         return cs_readl(cs5535au, ACC_BM0_PNTR);
203 }
204 
205 static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au)
206 {
207         cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN);
208 }
209 
210 static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au)
211 {
212         cs_writeb(cs5535au, ACC_BM1_CMD, 0);
213 }
214 
215 static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au)
216 {
217         cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE);
218 }
219 
220 static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au,
221                                           u32 prd_addr)
222 {
223         cs_writel(cs5535au, ACC_BM1_PRD, prd_addr);
224 }
225 
226 static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au)
227 {
228         return cs_readl(cs5535au, ACC_BM1_PRD);
229 }
230 
231 static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au)
232 {
233         return cs_readl(cs5535au, ACC_BM1_PNTR);
234 }
235 
236 static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
237                                           struct cs5535audio_dma *dma,
238                                           struct snd_pcm_substream *substream)
239 {
240         snd_dma_free_pages(&dma->desc_buf);
241         dma->desc_buf.area = NULL;
242         dma->substream = NULL;
243 }
244 
245 static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
246                                      struct snd_pcm_hw_params *hw_params)
247 {
248         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
249         struct cs5535audio_dma *dma = substream->runtime->private_data;
250         int err;
251 
252         err = snd_pcm_lib_malloc_pages(substream,
253                                         params_buffer_bytes(hw_params));
254         if (err < 0)
255                 return err;
256         dma->buf_addr = substream->runtime->dma_addr;
257         dma->buf_bytes = params_buffer_bytes(hw_params);
258 
259         err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
260                                             params_periods(hw_params),
261                                             params_period_bytes(hw_params));
262         if (!err)
263                 dma->pcm_open_flag = 1;
264 
265         return err;
266 }
267 
268 static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
269 {
270         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
271         struct cs5535audio_dma *dma = substream->runtime->private_data;
272 
273         if (dma->pcm_open_flag) {
274                 if (substream == cs5535au->playback_substream)
275                         snd_ac97_update_power(cs5535au->ac97,
276                                         AC97_PCM_FRONT_DAC_RATE, 0);
277                 else
278                         snd_ac97_update_power(cs5535au->ac97,
279                                         AC97_PCM_LR_ADC_RATE, 0);
280                 dma->pcm_open_flag = 0;
281         }
282         cs5535audio_clear_dma_packets(cs5535au, dma, substream);
283         return snd_pcm_lib_free_pages(substream);
284 }
285 
286 static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream)
287 {
288         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
289         return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE,
290                                  substream->runtime->rate);
291 }
292 
293 static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd)
294 {
295         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
296         struct cs5535audio_dma *dma = substream->runtime->private_data;
297         int err = 0;
298 
299         spin_lock(&cs5535au->reg_lock);
300         switch (cmd) {
301         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
302                 dma->ops->pause_dma(cs5535au);
303                 break;
304         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
305                 dma->ops->enable_dma(cs5535au);
306                 break;
307         case SNDRV_PCM_TRIGGER_START:
308                 dma->ops->enable_dma(cs5535au);
309                 break;
310         case SNDRV_PCM_TRIGGER_RESUME:
311                 dma->ops->enable_dma(cs5535au);
312                 break;
313         case SNDRV_PCM_TRIGGER_STOP:
314                 dma->ops->disable_dma(cs5535au);
315                 break;
316         case SNDRV_PCM_TRIGGER_SUSPEND:
317                 dma->ops->disable_dma(cs5535au);
318                 break;
319         default:
320                 dev_err(cs5535au->card->dev, "unhandled trigger\n");
321                 err = -EINVAL;
322                 break;
323         }
324         spin_unlock(&cs5535au->reg_lock);
325         return err;
326 }
327 
328 static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream
329                                                         *substream)
330 {
331         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
332         u32 curdma;
333         struct cs5535audio_dma *dma;
334 
335         dma = substream->runtime->private_data;
336         curdma = dma->ops->read_dma_pntr(cs5535au);
337         if (curdma < dma->buf_addr) {
338                 dev_err(cs5535au->card->dev, "curdma=%x < %x bufaddr.\n",
339                                         curdma, dma->buf_addr);
340                 return 0;
341         }
342         curdma -= dma->buf_addr;
343         if (curdma >= dma->buf_bytes) {
344                 dev_err(cs5535au->card->dev, "diff=%x >= %x buf_bytes.\n",
345                                         curdma, dma->buf_bytes);
346                 return 0;
347         }
348         return bytes_to_frames(substream->runtime, curdma);
349 }
350 
351 static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
352 {
353         int err;
354         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
355         struct snd_pcm_runtime *runtime = substream->runtime;
356 
357         runtime->hw = snd_cs5535audio_capture;
358         runtime->hw.rates = cs5535au->ac97->rates[AC97_RATES_ADC];
359         snd_pcm_limit_hw_rates(runtime);
360         cs5535au->capture_substream = substream;
361         runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]);
362         if ((err = snd_pcm_hw_constraint_integer(runtime,
363                                          SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
364                 return err;
365         olpc_capture_open(cs5535au->ac97);
366         return 0;
367 }
368 
369 static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
370 {
371         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
372         olpc_capture_close(cs5535au->ac97);
373         return 0;
374 }
375 
376 static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream)
377 {
378         struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
379         return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE,
380                                  substream->runtime->rate);
381 }
382 
383 static const struct snd_pcm_ops snd_cs5535audio_playback_ops = {
384         .open =         snd_cs5535audio_playback_open,
385         .close =        snd_cs5535audio_playback_close,
386         .ioctl =        snd_pcm_lib_ioctl,
387         .hw_params =    snd_cs5535audio_hw_params,
388         .hw_free =      snd_cs5535audio_hw_free,
389         .prepare =      snd_cs5535audio_playback_prepare,
390         .trigger =      snd_cs5535audio_trigger,
391         .pointer =      snd_cs5535audio_pcm_pointer,
392 };
393 
394 static const struct snd_pcm_ops snd_cs5535audio_capture_ops = {
395         .open =         snd_cs5535audio_capture_open,
396         .close =        snd_cs5535audio_capture_close,
397         .ioctl =        snd_pcm_lib_ioctl,
398         .hw_params =    snd_cs5535audio_hw_params,
399         .hw_free =      snd_cs5535audio_hw_free,
400         .prepare =      snd_cs5535audio_capture_prepare,
401         .trigger =      snd_cs5535audio_trigger,
402         .pointer =      snd_cs5535audio_pcm_pointer,
403 };
404 
405 static const struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = {
406         .type = CS5535AUDIO_DMA_PLAYBACK,
407         .enable_dma = cs5535audio_playback_enable_dma,
408         .disable_dma = cs5535audio_playback_disable_dma,
409         .setup_prd = cs5535audio_playback_setup_prd,
410         .read_prd = cs5535audio_playback_read_prd,
411         .pause_dma = cs5535audio_playback_pause_dma,
412         .read_dma_pntr = cs5535audio_playback_read_dma_pntr,
413 };
414 
415 static const struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = {
416         .type = CS5535AUDIO_DMA_CAPTURE,
417         .enable_dma = cs5535audio_capture_enable_dma,
418         .disable_dma = cs5535audio_capture_disable_dma,
419         .setup_prd = cs5535audio_capture_setup_prd,
420         .read_prd = cs5535audio_capture_read_prd,
421         .pause_dma = cs5535audio_capture_pause_dma,
422         .read_dma_pntr = cs5535audio_capture_read_dma_pntr,
423 };
424 
425 int snd_cs5535audio_pcm(struct cs5535audio *cs5535au)
426 {
427         struct snd_pcm *pcm;
428         int err;
429 
430         err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm);
431         if (err < 0)
432                 return err;
433 
434         cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops =
435                                         &snd_cs5535audio_playback_dma_ops;
436         cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops =
437                                         &snd_cs5535audio_capture_dma_ops;
438         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
439                                         &snd_cs5535audio_playback_ops);
440         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
441                                         &snd_cs5535audio_capture_ops);
442 
443         pcm->private_data = cs5535au;
444         pcm->info_flags = 0;
445         strcpy(pcm->name, "CS5535 Audio");
446 
447         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
448                                         snd_dma_pci_data(cs5535au->pci),
449                                         64*1024, 128*1024);
450         cs5535au->pcm = pcm;
451 
452         return 0;
453 }
454 
455 

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